Saw clamping and filing machine



April 25, 1950 J. w. COGHLAN 2,505,273

SAW CLAMPING AND FILING MACHINE Filed Feb. 2?, i948 s Shee'ts-Sheet 1 O:Q i Jaco 71160 72707;

April 25, 1950 J. w. COGHLAN SAW CLAMPING AND FILING MACHINE 3Sheets-Sheet 2 Filed Feb. 27, 1948 In re!!! r e n M t A Apri! 25, .1950J. w. COGHLAN SAW CLAMPING AND FILING MACHINE Filed Feb. 27,- 1948 3Sheets-Sheet 3 www A :10 rneys Patented Apr. 25, 1950 This inventionrelates to an improved saw s ammin and li ies iiia hi ri ififir ar .l lto impro ement 93 mi an 'U- i zli ent 225. 91 l d l pi i i'l 1 and ent daw am and fil g Among the objects pithe pr esent invention in add t ontoth ne eti q ri in my??? t heretofore referred to, are toprovidean"improved stru u whereby at l 9a .bie i a 'i 'suppbrid forreciprocal engagement withthe teeth of'a ,tsaw. e .b tt emreet o aidihai b e'd -d p a ed'lon it inall th saw a :a i "e :toithe stanc beteen the tee ers i wh n t e h by improve awl air! Pe k-ba mea n throughthe simple expedient of sv viil 1 .file support upwardly away from thesaw and "then downwardly" and back toward thesaw.

A further object of the'invention is to pro id .pawl and rack bar meansior efiectively lockin the sawsupport inits'adjusted position with re-'sharpening'theteeth'uniform1y.-

'7 Still'afurther object ofthe invention is to provide meansforadjusting the pawl andrack bar and latch means-ito accommodate sawteeth of spect to'each of the recessesof the teeth to i nsure differentsizes and 'Wherloy said-rack bar-means may be initially displacedrelatively to the-frame of the machinefor accurately positioning itrela- ":ti,vely,- to vthe teeth-of a' saw clamped 1 y the machine frame.jNumerous other objects and advantages of the invention will hereinafterbecome more fully asen r m ith pw fis s er i i'qn i l l a in s. i strain a presentl pr fer d pm .se ent thereg tand wh xsm; assu q 'atp a V ew9i i aisl ie s c clamp and file guidingm chine;

' spE nr Bis ap rcntel r mea v w h Fi 11 1 e;3 isan endelevatnalview'of'thsame JOOK I QLUTQ E QtQ righ -Q ,Fi e'l 'gpre lisa crosssectional view oilthe machine ken substantially along a plane asindicated by V p i f ure 2; l is axfrag in tar-y perspective view of 59ns- 2. we)

The end member Reach include a pair of outtiirne'd" foot membersl5-which-are adapted to rest upon a suitablesupporting surfaceas in"dic'ated'at l6 and which are 'apertured toreceive 5 'fa's'tenings [1for detachably anchoring the-frame to the"supporting"surface-16: Each ofthe end members I 2; which i'sdisposed irianupright posi- Q't'ionrelatively to" the surface I 6'; when secured thereto as illustratedinFigure 2;---isprovided with 1G an o'pening "'inithe-lower" rearportion thereof to r'eciv'e afmachinvscrew l8 which' ex-tendsinwardlv'tlierethrought' "The" bar [3 is disposed longitudinally of theframe l {and between the end portions IZ thereof and is provided with E5thie'dd recessedendsfor receiving-the-machine "screws "[8' and"whiebysaid bards anchored to the "end mem ers 12"' andiunctionsto connect saidmembers-was illustratedin' Figure 4, thebar (3 is prfrablyofrfomcircularcross section. The

20 bar TM "is disposed against "the forward edges of (the lowerp'ortionsbftheendmembers l2 and in a'"vertical plane andismrovided adjacent theends" threof "Withhpenings to' loosely receive machine-screws I9"Wl'1i0h extend therethrough and into threaded iecesses'zfl of'the endmembers iZarid'so' that'saidbarrlalsoiunctions toconnecfithe'en'dmeinbers 12; "The bar! t is provided tvithaniiiwardly'extending"ledge or shelf 2! at "i lowefe'nda'iid'for apurpose whichwill here- "fin'aitr becomefipparent. ":The-upper portionor each end member: 1'2 'i'sriroVided with an opening "2 2"thro'ug hwhich extends the'r'estricted threaded "end 23' of a, rod M'Whichlikewise extends between said end members"! 2 and which secured there-351 t by nuts 25'whicli'engage the threaded rod ends 23 andwhichbearagainst "the outer" sides ofthe forwardly of its openingZLis providedwith an "upwardly openi'ng nOtchZS. A rack bar 2? which 4 is" preferably-o'f" square cross secti0n,'as illustrated in Figure 4; disposed betweenthe .end menibers'l 2 and is provided with a restricted stem '28 atoneend thereof which engages one of the :notches 26 and a restrictedstem projects from I ifi theopposite nd thereof and which includes aninner portion 29 which is preferablyof circular cross se ctiofiandianouten'portion 3B which. is preferably of "square cross section and withthe sidesthereof disp'osed at-lforty-five degree angles fio tothesidesof therack harZl. Said portion 38 W ri upwardlv l Hi6 rsri awr -i 2 i anexpansion coiled spring 3| which bears against an end of the rack bar 21and the last mentioned end member l2 for urging said rack bar from rightto left of Figure 1. The end member l2 in which the shank 28 is engaged,is provided with a threaded opening adjacent its notch for receiving asetscrew 32 which extends inwardly therethrough for engaging the end ofthe rack bar 21, located adjacent thereto, and so as to displace saidrack bar from left to right of Figure 1 within the frame I! and againstthe action of the expansion spring 3i, when the setscrew 32 is advancedinwardly of the frame and for a purpose 7 which will hereinafter becomeapparent.

A file guide, designated generally 33, includes an upper section,designated generally 34 and a lower section, designated generally 35.The upper section 35, as best illustrated in Figure 6, is formed from asingle casting and includes a bar 36 having upstanding aligned sleeveportions 31 'at each end thereof which slldably engage the rod 24 forslidably supporting the file guide 33 thereon for movement lengthwise ofthe frame The bar is also provided with a sleeve portion 38 which isoffset transversely from the sleeves 31 and which is disposed at a rightangle thereto and an arm 39 extends outwardly from the sleeve portion 38in a direction away from the bar 36 and provides a support for a smallersleeve 50 which is likewise disposed at right angles to the sleeves 31and which is provided with an upwardly opening notch ll and a laterallyprojecting stem 42.

As best seen in Figure 4, the lower file guide section 35 includes a bard3 having an upstanding enlargement 44 adjacent one end thereof which isprovided with a threaded opening 35 extending therethrough and intowhich is threaded one end of a bolt 45 which is provided with anunthreaded intermediate portion which extends loosely through the sleeve38 and the upper threaded end of which is engaged by a wing nut 41 formounting the section 35 beneath the section 36. The ends of the bar 43are each provided with a depending apertured extension G8 containingaligned bushings 49 having corresponding non-circular bores forreceiving a file supporting rod 50 of a similar cross section and whichis slidably and non-rotatably disposed in said bushing s9 and supportedthereby for reciprocating movement relatively to the file guide 33 andtransversely of the frame The file supporting rod is provided with adepending hanger 5| preferably equipped with an insert 52 which isretained there'n by a nut 54 and setscrew 55 and which has a recessedinner end as indicated in dotted lines in Figure 4 for receiving one endof a file 56. The rod 59 is provided with a second hanger 5'! whichdepends or extends transversely therefrom and which is provided with asleeve 58 which aligns with the insert 52 and which is threaded toreceive an adjustable fie support ng unit, designated gen erally 59 asbest illustrated in Figure 8. The unit 59 includes an externallythreaded sleeve 50 which adjustably engages the threaded bore of thesleeve 58 and which is provded with a knurled enlargement 6| at one endthereof through which end is removably inserted a rod 62 hav ng anenlarged head 63 at its outer end provided with a tapered outwardlyopening recess 64 for rece v ng the opposite end of the file 56. A nut65 is threaded on the sleeve and a cap nut '65 is adapted to be threadedon said sleeve 60 behind the nut 55 and is provided with an opening 61in its outer end for receiving a restricted ex tension 58 on theopposite end of the rod 62 and. which is transversely apertured toreceive a cotter pin 59 for detachably retaining the cap nut 66 on thesleeve 50 and for thereby retaining the unit 59 assembled. It will bereadily apparent that with the lock nut backed off from the sleeve 58the unit 59 can be manually rotated by engaging the fingers with eitherthe knurled head 6| or the cap nut 65 for advancing said unit to engagesaid last mentioned end of the 'file 56 in the notch 64 for securing thefile 56 between the inserts 52 and said unit 59 after which the lock nut65 is advanced into a position against the outer end of the sleeve 58,as illus- Figure 2, is provided with a bar portion It which depends fromthe bar 35 and which is provided with a threaded opening in the lowerend thereof for receiving a screw H which extends rearwardlytherethrough and which is adapted to be moved into and out of engagementwith the forward side of the bar l3 and which is retained in variousadjusted positions by a setscrew i2 which extends into the bar Ill atright angles to the screw H and which is adapted to be advanced intoengagement with said screw for locking it in adjusted position.

As seen in Figure 4, a stem 13 is reciprocally disposed in the bore ofthe sleeve 40 and is provided adjacent its lower end with an enlargementor collar M which engages the enlarged lower end of the bore of thesleeve 4|] and which is reciprocally disposed therein. An expansioncoiled spring E5 is disposed in the enlarged lower end of the sleeve Gilon the stem 13 and bears against the collar or enlargement M for urgingsaid stem downwardly of the sleeve. The stem 13 is pro- .vided w th aradially projecting pin 16 which slidably engages the notch 4| thereofto prevent rotation of said stem in the sleeve 4|! and to retain saidstem so that its lower sharpened end, forming an edge 11 is disposedtransversely of the rack bar 21. Said rack bar 21, as best seen inFigure 5, is provided with longitudinally spaced notches 18 in each edgethereof and which notches are spaced different distances apart andstaggered relatively to notches of the other edges of the bar 21. Itwill be readily apparent that the spring 15 will urge the edge 11 intoengagement with one of the notches 18 of the uppermost edge of the rackbar 21 and when the portion 1! is disposed in one of said notches, thefile gu de 33 will be held against sliding movement long tudinally ofthe frame II Referring to Figure '7, a block 19 is provided with anopening 89 to receive the stem 42 for mounting said block 19 on the fileguide section 34. A setscrew 8| extends through an edge of the block 19into its opening 8|! for clamping engagement with the stem 42 fordetachably and adjustably securing the block 19 thereon. The lowerportion of the block 19 is provided with a recess 82 for receiving anend of a pawl 83 which is pivotally mounted therein on a pin 84 andwhich isprovided with a depending opposite end 85 which is likewiseadapted to engage notches of the upper edge of the rack bar 21.

The bar It constitutes one element of a clamp and cooperates with aclamping element, designated generally 85 and which includes alongieases; bar 88-; wlii'"h is straight; is dispdsed of the bar 8'! andhas the-ends thereof welded thereto; as seen at 89, adjacent to butspacedfrom the endsofthe bar 81. A "saw blade 9c is adaptedfto beclamped between "the outer surface oi. the bar 14 and the adjacentsurface of' the' bar STby tightening the machine bolts IQ for drawingthe" unit 36' inwardly and toward the bar i l and for causing the bar8'! thereof tofbe flexed toward a straightened position for yieldably'clamping the saw blade 90 aga st thebar l4 and with the upper, toothededge thereofextending to above the upper edges of the bar l4 and thecl'amping unit 86, as seen n a A'plurality of height gauges B l eachconstian; angular bar, are pivotally mounted on ,7 or shelf 2]; each bymeans of a hinge 92 and said height gauges 9"! are swingable topositions as seen, in Figures 3 and 4 over the bar l4 and clampingelement 86 to be engaged by the toothed edge 'o f the blade 90 to limitthe height at which said edge can be disposed when clamped inthe'machine It or said height gauges 9| can beswungon their hinges 92counterclockwise as seen in Figure 4' and out of position over theclamping element 86;

Assuming that a saw 96 is clamped as previously 'describedend,asillustrated in the drawings jand with its upper toothed edge at theproper level by the employment of the height gauges and so; thatsaid'to'othe'df edge is in a horizontal plane,

after thegclamp'ingof the, saw has been completed the height gauges areswung to inoperative positions so as not to interfere witn the filing ofall of the saw teeth. The rack bar-'21 is ad- 'just'ed so that thenotches 18 of the uppermost edge thereof will c'onform'properly to thespacing between the teeth of thejsaw 90 and the setscrew 1,1isj'ajdjusted tolim'it the extent that the handle "end 93 of the fileguide rod 5!] can be swung downwardly and accordingly the extent towhich the file '56: can sharpen the teeth of the saw '9!) and so thateach of the teeth will be filed to thefsame depth. With, the wing nutil'loos'ened the file'gui'de supportin section 35 is. adjustedrelatively tothe section 34 and clamped in adiusted position so that thefile supporting rod '50 will. be disposed at the proper. angle to theteeth of the Saw-91] arid will accordingly hold the file 56 at theproper angle for "sharpening the saw teeth, depending upon the extent;that the saw teetha'r'e flared and which depends'upon the type "of sawbeing "sharpened. Likewise, 'ifwh'en the file 56 engaged between twoof'the teeth'of the.

"saw at. the edge 11 of the lock stem 13 is not disposed to properlyregister with one of the notches '18 of the uppermost edge of the rackbar 2?, by adjustment of the set'screw 32, as previously'described, saidrackbar 21 may be displaced "longitudinally. of the machine It! untilthe edge 11 seats one of the uppermost notches 18 for :"epen registeringthe rack bar "21 with the fteet'h'of, the saw 9!! as clamped 'inf'themachine 11!. the machine thus assembled and With "the metae'ngag'ingbetweentwo of the teeth of the planets, the handle 93 iinanna'lly engaged to reciprocate thefr'o'd 59 in the guide 33 and sothat the file 56 will be reciprocated between said teeth for sharpeningthe teeth. The file guide 50 "can be gradually swung downwardly in aclock- "tvi'se direction as; een in Figure 4 by pressure exerted on thehandle 93 as the teeth are thus ifgharpened "and until the screw 1 l{comes in con- "tact with 'tliebar 13 to preventrunner clockwiseswinging movement of the-parts and to thereby limit-the depth to whichthe teeth of the saw each toothto the same depth. The description of theoperation of themachine lG-upto-this-point is substantially the sameasthat of my prior PatentNo. 2,256,016, heretofore; referred-to.

Instead of havingto manually displace the file guide- 3-3 longitudinally0f=the machine frame as in my prior patent; by swinging upwardly on thehandle 93 theedge 1'! of. the stem; 13 will'be disengaged from the rackbar 21 and the pawl '83 will swing downwardly and will slide from leftto right as seen in Figure 2-relatively to the rack bar 2'! until itsend 85 engages an upwardly facing notch 18 disposed next to the right ofthe notch previously engaged thereby; By then swinging the handle 93downwardly, said pawl will force the file guide unit 33 to be displacedto the right a distance equal to the spacing between two of the adjacentupwardly facing notches l8 and so'that the edge I? can engage the nextnotch to the right of the notch previously engaged thereby and when sodisposed will be properlypositioned for locatingthe file,5 6 between thenext two teeth of the saw 95. By repeating this operation, it will bereadily apparent-that the file guide and parts suppoited, thereby can bedisplaced 'step-by-step from left to right longitudinally ofthe machineframe l I for accurately positioning the file 56 for sharpening each ofthe teeth. of the saw 80. By loosening the setscrew 8! the; block 19 canbe adjustably positioned on stem 42 for properly spacing the pawl endfrom the edge 11 so that both of. said portions will simultaneouslyengage notches 78 of the uppermost bar edge and which spacing will varyaccording to the variationsin-thespacing of the notches.

Obviously, the rack bar 2'! can be disengaged from the end pieces I Zandturned to position any of the notched edges thereof uppermost and sothat the uppermost disposed notches will be spaced to correspond to thespacing of the teeth of the saw clamped in the machine 18.

Various modifications and changes are contemplated and may obviously beresorted to, without departing from the spiritorscope ofthe invention ashereinafter-defined by the appended claims.

I claim as-my invention:

1. A saw filing machine comprising a frame, clamping means fordetachably clamping a saw blade in said frame, a rod having adjustablemeans for detachablysupporting'afile longitudinally thereof, a guide forreciprocally supporting said rod, means for supporting said guide in themachine frame for rotary movement relatively thereto and forreciprocating movement longitudinally of the machine frame, a rack barmounted in the frame and longitudinally thereof, a latch elementyieldablycarri d by saidgu-ide supporting means for selectively.engaging spaced notches of said rack bar for selectively by said guidesupporting means above the rack jguide supporting means is swung in onedirection 'for elevating'the latch element and dis- 'bar' for swingingmovement toward and away from the rack bar, said pawl being displaceablein one direction along said rack barwhen the "engaging it from therackybar .andfto position the pawl in closer proximity 'to'thelatchelement bar for causing the guide supporting means to be displacedlongitudinally of the machine frame when swung in the opposite directionfor displacing the file supporting rod longitudinally of the saw toposition the file carried thereby for engagement with another tooth ofthe saw and for displacing said latch element into a position forengaging another notch of the rack bar, said guide supporting meansbeing formed of swivelly connected sections, and means for clamping saidsections in a plurality of adjusted positions for angularly adjustingthe file and file supporting rod relatively to the machine frame and tothe saw blade.

2. A saw filing machine comprising a frame, clamping means fordetachably clamping a saw blade in said frame, a rod havin adjustablemeans for detachably supporting a file longitutudinally thereof, a guidefor reciprocally supporting said rod, means for supporting said guide inthe machine frame for rotary movement relatively thereto and forreciprocating movement longitudinally of the machine frame, a rack barmounted in the frame and longitudinally thereof, a latch elementyieldably carried by said guide supporting means for selectivelyengaging spaced notches of said rack bar for selectively positioning thefile supporting rod for registry of the file, carried thereby, with thediiferent teeth of the saw, and a pawl pivotally cairied by said guidesupporting means above the rack bar for swinging movement toward andaway from the rack bar, said pawl being displaceable in one directionalong said rack bar when the guide supporting means is swung in onedirection for elevating the latch element and disengaging it from therack bar and to position the pawl in closer proximity to the latchelement and for engagement with a notch of the rack bar for causing theguide supporting means to be displaced longitudinally of the machineframe when swung in the opposite direction for displacing the filesupporting rod longitudinally of the saw to position the file carriedthereby for engagement with another tooth of the saw and for displacingsaid latch element into a position for engaging another notch of therack bar, said rack bar being of polygonal cross section and havinglongitudinal edges each provided with a single row of notches, thenotches'of the different longitudinal edges of said rack bar beingdifferently spaced for registry with saw blades having differentlyspaced teeth, and means for displacing the rack bar longitudinally ofthe machine frame for properly locating the notches thereof relativelyto the teeth of the saw to be sharpened.

3. A saw filing machine comprising a frame, clamping means fordetachably clamping a saw blade in said frame, a rod havin adjustablemeans for detachably supporting a file longitutudinally thereof, a guidefor reciprocally sup- I porting said rod, means for sup-porting saidguide in the machine frame for rotary movement rela-V tively thereto andfor reciprocating movementlongitudinally of the machine frame, a rackbar mounted in the frame and longitudinally thereof, a latch elementyieldably carried by said guide supporting means for selectivelyengaging spaced I notches of said rack bar for selectivelypositionswinging movement toward and away from the rack bar, said pawlbeing displaceable in one direction along said rack bar when the guidesupporting means is swung in one direction for elevating the latchelement and disengaging it from the rack bar and to position the pawl incloser proximity to the latch element and for engagement with a notch ofthe rack bar for causing the guide supporting means to be displacedlongitudinally of the machine frame when swung in the opposite directionfor displacing the file supporting rod longitudinally of the saw toposition the file carried thereby for engagement with another tooth ofthe saw and for displacing said latch element into a position forengaging another notch of the rack bar, and means for displacing saidrack bar longitudinally of the machine frame for properly positioningthe notches thereof relatively to the teeth of the saw blade.

4. A saw filing machine comprising a frame, clamping means fordetachably clamping a saw blade in said frame, a rod havin adjustablemeans for detachably supporting a file longitutudinally thereof, a guidefor reciprocally supporting said rod, means for supporting said guide inthe machine frame for rotary movement relatively thereto and forreciprocating movement longitudinally of the machine frame, a rack barmounted in the frame and longitudinally thereof, a latch elementyieldably carried by said guide supporting means for selectivelyengaging spaced notches of said rack bar for selectively positioning thefile supporting rod for registry of the file, carried thereby, with thedifferent teeth of the saw, and a pawl pivotally carried by said guidesupporting means above the rack bar for swinging movement toward andaway from the porting means is swung in one direction for elevating thelatch element and disengaging it from the rack bar and to position thepawl in closer proximity to the latch element and for engagement with anotch of the rack bar for causing the guide supporting means to bedisplaced longitudinally of the machine frame when swung in the oppositedirection for displacing the file supporting rod longitudinally of thesaw to position the file carried thereby for engagement with anothertooth of the saw and for displacing said latch element into a positionfor engaging another notch of the rack bar, said rack bar being slidablyand non-rotatably mounted in the frame and longitudinally thereof,spring means for urging said rack bar toward one end of the frame, andfeed screw means for displacing the rack bar toward the opposite end ofsaid frame for adjustably locating the notches thereof relatively to thesaw teeth.

5. A saw filing machine comprising a frame,

. clamping means for detachably clamping a saw blade in said frame, arod having adjustable means for detachably supporting a filelongitudinally thereof, a guide for reciprocally supporting said rod,means for supporting said guide in the machine frame for rotary movementrela- 9 the saw, and a pawl pivotally carried by said guide supportingmeans above the rack bar for swinging movement toward and away from therack bar, said pawl being displaceable in one direction along said rackbar when the guide supporting means is swung in one direction forelevating the latch element and disengaging it from the rack bar and toposition the pawl in closer proximity to the latch element and forengagement with a notch of the rack bar for causing the guide supportingmeans to be displaced longitudinally of the machin frame when swung inthe opposite direction for displacing the file supporting rodlongitudinally of the saw to position the file carried thereby forengagement with another tooth oi'the saw and for displacing said latchelement into a position for engaging another notch of the rack bar, anda height gauge pivotally supported by the clamping means REFERENCESCITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,076,112 Guin et al. Oct. 21,1913 1,207,544 Hanson Dec. 5, 1916 2,019,330 Altman Oct. 29, 19352,256,016 Coghlan Sept. 16, 1941 2,427,412 McCulley Sept. 16, 1947

